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Pterosaur and bird tracks from Early Cretaceous of Xinjiang, China (free pdf)

From: Ben Creisler

A new paper. The pdf is free:

He Qing, Xing Lida, Zhang Jianping, Martin G. Lockley, Hendrik Klein,
W. Scott Persons IV, Qi Liqi and Jia Chengkai (2013)
New Early Cretaceous Pterosaur-Bird Track Assemblage from Xinjiang,
China: Palaeoethology and Palaeoenvironment.
Acta Geologica Sinica (English Edition) 87(6):1477-1485

A pterosaur-bird track assemblage from a sandstone-siltstone-mudstone
sequence of the Lower Cretaceous Tugulu Group of Xinjiang comprises
the first pterosaur track record from this province and the largest
specimen thus far known from China. The pterosaur tracks are assigned
to the ichnogenus Pteraichnus based on the triangular overall-shape,
the four elongate digit traces and the robust manual digit trace III.
Supposed trackmakers were dsungaripterid pterodactyloids whose
skeletal remains are well known from the Tugulu Group. The bird tracks
that occur on the same surface, are those of typical shorebirds, known
from different other localities in southeast Asia. The congruence with
Koreanaornis dodsoni described from the same stratigraphic level
justifies an assignment to this ichnospecies. This is a further
evidence of the co-occurrence of pterosaurs and birds in a typical
lakeshore environment with possible seasonal alteration of water
supply and aerial exposure indicated by wave ripples, mudcracks and
repeated cycles of coarse to fine sediment. Pterosaurs and birds
frequented the shoreline and may have fed also on the numerous
invertebrates such as the Scoyenia tracemaker that left abundant